diff options
Diffstat (limited to 'arch/c6x/include/asm/uaccess.h')
-rw-r--r-- | arch/c6x/include/asm/uaccess.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/c6x/include/asm/uaccess.h b/arch/c6x/include/asm/uaccess.h new file mode 100644 index 00000000000..453dd263bee --- /dev/null +++ b/arch/c6x/include/asm/uaccess.h | |||
@@ -0,0 +1,107 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2011 Texas Instruments Incorporated | ||
3 | * Author: Mark Salter <msalter@redhat.com> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License version 2 as | ||
7 | * published by the Free Software Foundation. | ||
8 | */ | ||
9 | #ifndef _ASM_C6X_UACCESS_H | ||
10 | #define _ASM_C6X_UACCESS_H | ||
11 | |||
12 | #include <linux/types.h> | ||
13 | #include <linux/compiler.h> | ||
14 | #include <linux/string.h> | ||
15 | |||
16 | #ifdef CONFIG_ACCESS_CHECK | ||
17 | #define __access_ok _access_ok | ||
18 | #endif | ||
19 | |||
20 | /* | ||
21 | * __copy_from_user/copy_to_user are based on ones in asm-generic/uaccess.h | ||
22 | * | ||
23 | * C6X supports unaligned 32 and 64 bit loads and stores. | ||
24 | */ | ||
25 | static inline __must_check long __copy_from_user(void *to, | ||
26 | const void __user *from, unsigned long n) | ||
27 | { | ||
28 | u32 tmp32; | ||
29 | u64 tmp64; | ||
30 | |||
31 | if (__builtin_constant_p(n)) { | ||
32 | switch (n) { | ||
33 | case 1: | ||
34 | *(u8 *)to = *(u8 __force *)from; | ||
35 | return 0; | ||
36 | case 4: | ||
37 | asm volatile ("ldnw .d1t1 *%2,%0\n" | ||
38 | "nop 4\n" | ||
39 | "stnw .d1t1 %0,*%1\n" | ||
40 | : "=&a"(tmp32) | ||
41 | : "A"(to), "a"(from) | ||
42 | : "memory"); | ||
43 | return 0; | ||
44 | case 8: | ||
45 | asm volatile ("ldndw .d1t1 *%2,%0\n" | ||
46 | "nop 4\n" | ||
47 | "stndw .d1t1 %0,*%1\n" | ||
48 | : "=&a"(tmp64) | ||
49 | : "a"(to), "a"(from) | ||
50 | : "memory"); | ||
51 | return 0; | ||
52 | default: | ||
53 | break; | ||
54 | } | ||
55 | } | ||
56 | |||
57 | memcpy(to, (const void __force *)from, n); | ||
58 | return 0; | ||
59 | } | ||
60 | |||
61 | static inline __must_check long __copy_to_user(void __user *to, | ||
62 | const void *from, unsigned long n) | ||
63 | { | ||
64 | u32 tmp32; | ||
65 | u64 tmp64; | ||
66 | |||
67 | if (__builtin_constant_p(n)) { | ||
68 | switch (n) { | ||
69 | case 1: | ||
70 | *(u8 __force *)to = *(u8 *)from; | ||
71 | return 0; | ||
72 | case 4: | ||
73 | asm volatile ("ldnw .d1t1 *%2,%0\n" | ||
74 | "nop 4\n" | ||
75 | "stnw .d1t1 %0,*%1\n" | ||
76 | : "=&a"(tmp32) | ||
77 | : "a"(to), "a"(from) | ||
78 | : "memory"); | ||
79 | return 0; | ||
80 | case 8: | ||
81 | asm volatile ("ldndw .d1t1 *%2,%0\n" | ||
82 | "nop 4\n" | ||
83 | "stndw .d1t1 %0,*%1\n" | ||
84 | : "=&a"(tmp64) | ||
85 | : "a"(to), "a"(from) | ||
86 | : "memory"); | ||
87 | return 0; | ||
88 | default: | ||
89 | break; | ||
90 | } | ||
91 | } | ||
92 | |||
93 | memcpy((void __force *)to, from, n); | ||
94 | return 0; | ||
95 | } | ||
96 | |||
97 | #define __copy_to_user __copy_to_user | ||
98 | #define __copy_from_user __copy_from_user | ||
99 | |||
100 | extern int _access_ok(unsigned long addr, unsigned long size); | ||
101 | #ifdef CONFIG_ACCESS_CHECK | ||
102 | #define __access_ok _access_ok | ||
103 | #endif | ||
104 | |||
105 | #include <asm-generic/uaccess.h> | ||
106 | |||
107 | #endif /* _ASM_C6X_UACCESS_H */ | ||